A boardview (component placement) file for Lenovo hardware (board NM-C421). Shared as “ThinkPad E15 - NM-C421 REV 1.0 BoardView.tvw.zip” — a .zip file, 1.60 MB.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @Satale_bios_esquemas_Laptop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip